<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>


<script>
    /*    var f=function g(){
     return 23;
     };

     console.log(typeof g())*/

    (function (x) {
        delete  x;
        return x
    })(1)
</script>



</body>
</html>